What is Sonic the Hedgehog CD (Mobile)?

Sonic the Hedgehog CD (Mobile) is an open-source engine reimplementation of Sonic CD. A new engine written from scratch that loads the original game's data files. The original game ran on Windows, iOS and Android.

Do I need the original game files to run Sonic the Hedgehog CD (Mobile)?

Yes. The project does not include the original game's assets, so you need your own copy.

Sonic the Hedgehog CD (Mobile)

Engine reimplementationActive

A new engine written from scratch that loads the original game's data files.

Based on Sonic CD

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Image of the original game, Sonic CD. This project has no screenshots of its own yet.

Sonic CD (original game, not this project) — Image of the original game, Sonic CD. This project has no screenshots of its own yet.

Links, repository & details

About

It will not run without game assets from an official release of Sonic CD, which the player has to buy or download officially.

How it differs from the original

Compared with the mobile versions, its rendering backend is based on the PC version, so palettes (such as Tidal Tempest water) are fully supported.

Getting started

Get the game assets from an official release of Sonic CD (Steam, Epic Games Store, Nintendo Switch, iOS or Android), then build the project with CMake. A dev menu opens with the Esc key if enabled in the config. Only FMV files from the original Steam release are supported.

Known issues & limitations

Only FMV files from the original Steam release are supported; mobile and Origins video files do not work.
The mobile releases have been delisted, though previous downloaders can redownload them from their device or store account's purchase history.

What you need to run it

Original game files required. The project ships code only; you provide your own copy of the game (Windows, iOS, Android version).

You need assets from an official release; the project will not run without them.

Features

The display is sharp and pixel-perfect.
A built-in mod loader and API support mods, save-file redirection, and XML GameConfig data.
The default rendering backend supports palettes.

Controls

When enabled in the config, press ESC to open the dev menu from anywhere.
With the dev menu enabled, F1 loads the first scene in the Presentation stage list, usually the title screen.
With the dev menu enabled, F2 and F3 load the previous and next scene in the current stage list.

Summarised from the project's README.

Additional notes

Debug keys: With devMenu enabled, F12 pauses, F11 steps and fast-forwards, F5 reloads the scene, and F8/F9 show hitboxes.

FAQ

What is Sonic the Hedgehog CD (Mobile)?: Sonic the Hedgehog CD (Mobile) is an open-source engine reimplementation of Sonic CD. A new engine written from scratch that loads the original game's data files. The original game ran on Windows, iOS and Android.
Do I need the original game files to run Sonic the Hedgehog CD (Mobile)?: Yes. The project does not include the original game's assets, so you need your own copy.